US Bridges

I-75 NB over New Castle Waterway

Fair

Sarasota County, Florida · 3.4MI S of Toledo Blade · Structure no. 170138

Built
1981
44 years old, rebuilt 2016
Condition
Fair
inspected March 2025
Type
Slab
Concrete Continuous
Length
131 ft
4 main spans
Daily traffic
27,750
2023 count
Owner
State
State Highway Agency

About this bridge

I-75 NB over New Castle Waterway is a concrete continuous slab carrying I-75 NB over New Castle Waterway in Sarasota County, Florida. It was built in 1981 and reconstructed in 2016, so it is 44 years old, older than the Florida average of 41.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 27,750 vehicles a day, roughly 15% of them trucks, projected to reach 48,146 by 2042. The structure is 131 ft (40 m) long and 59 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesI-75 NB
CrossesNew Castle Waterway
Location3.4MI S of Toledo Blade
RouteInterstate 75
CountySarasota County
StateFlorida
Coordinates27.08017, -82.10739
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.8 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length131 ft (40 m)
Longest span33 ft (10 m)
Deck width59 ft (18 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,750 (2023)
Projected traffic48,146 by 2042
Trucks15%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-75 NB over New Castle Waterway built?

It was built in 1981, making it 44 years old in 2025. It was reconstructed in 2016.

What condition is I-75 NB over New Castle Waterway in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2025.

How much traffic does I-75 NB over New Castle Waterway carry?

About 27,750 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is I-75 NB over New Castle Waterway?

The structure is 131 ft (40 m) long with a longest span of 33 ft (10 m) and a deck 59 ft wide.

Who owns I-75 NB over New Castle Waterway?

It is owned by the State Highway Agency.